Is using underscore suffix for members beneficial?

Question

class C {
 private:
  int member_; // here is the underscore I refer to.
}

This underscore is recommended by Google Style Guide and Geosoft\'s C++

Answer 1

This is basically a religious argument so you're never going to reach a consensus on this style. FWIW, I use this style for my member variables for reasons already stated by others, e.g.:

class Foo
{
public:
  Foo(std::string name, int age) :
    name_(name),
    age_(age)
  {
  }

  std::string name() const { return name_; }
  void name(const std::string& name) { name_ = name; }

  int age() const { return age_; }
  void age(int age) { age_ = age; }
private:
  std::string name_;
  int age_;
};

Just adopt something you're happy with and stick with it.